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x in (-oo:+oo)
(x+5)/2+(x-1)/2 = 0
x+x-1+5 = 0
2*x+4 = 0
(2*x+4)/2 = 0
(2*x+4)/2 = 0 // * 2
2*x+4 = 0
2*x+4 = 0 // - 4
2*x = -4 // : 2
x = -4/2
x = -2
x = -2
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